CN110360000B - Air intake control method for direct injection gasoline engine - Google Patents
Air intake control method for direct injection gasoline engine Download PDFInfo
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- CN110360000B CN110360000B CN201810312979.4A CN201810312979A CN110360000B CN 110360000 B CN110360000 B CN 110360000B CN 201810312979 A CN201810312979 A CN 201810312979A CN 110360000 B CN110360000 B CN 110360000B
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- vortex street
- gas
- airflow
- gasoline engine
- injection gasoline
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
- F02B31/04—Modifying induction systems for imparting a rotation to the charge in the cylinder by means within the induction channel, e.g. deflectors
- F02B31/06—Movable means, e.g. butterfly valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/0015—Controlling intake air for engines with means for controlling swirl or tumble flow, e.g. by using swirl valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses an air inlet control method of a direct injection gasoline engine, which comprises the following steps: a Karman vortex street generating device is arranged on an airflow channel of an air inlet system of the direct injection gasoline engine; when the direct-injection gasoline engine runs, obtaining the actual Reynolds number of the airflow flowing through the airflow channel; and judging whether the actual Reynolds number falls within a preset Reynolds number range, if so, opening the karman vortex street generating device to enable the airflow in the air inlet system to generate karman vortex street phenomenon through the karman vortex street generating device, and if not, closing the karman vortex street generating device. The method can improve the turbulence level of fluid entering the cylinder, thereby enhancing the air flow movement in the cylinder, improving the oil-gas mixing process, improving the flame propagation rate, improving the performance of the engine, and simultaneously reducing the emission of Hydrocarbon (HC) and particles. The invention also discloses an air inlet control device of the direct injection gasoline engine.
Description
Technical Field
The invention relates to the technical field of automobile engines, in particular to an air intake control method for improving the performance of a direct injection gasoline engine. The invention also relates to a control device for improving the performance of the direct injection gasoline engine.
Background
The gasoline in-cylinder direct injection technology has the advantages of accurate fuel injection quantity control and accurate mixer concentration control, and by means of directly injecting fuel into the cylinder, the intake density can be improved, the knocking tendency is reduced, and the gasoline in-cylinder direct injection technology is widely applied to various large host factories at present. However, when the direct injection gasoline engine is in a low-speed and low-load working condition, the opening degree of a throttle valve is small, the air flow speed is low, and the air flow movement level in the cylinder is low, so that the fuel and the air are not uniformly mixed. During combustion, particularly early in the combustion, lower in-cylinder turbulence levels can increase ignition instability, leading to increased cyclic fluctuations in combustion. Under the high-speed heavy load working condition, the fuel injection quantity is increased, so that fuel oil collides with the wall surface of a cylinder and the top of a piston, the oil-gas mixing time is short, the fuel oil atomization is poor, and the emission of HC and particles is deteriorated.
The turbulence is an important flow form in an engine cylinder and is an important parameter influencing the performance of the engine, and the higher turbulence level can reduce an oil film on the wall surface, improve the uniformity of mixed gas and improve the combustion process. Other attempts to improve in-cylinder airflow movement include providing a pivotable flap or plate in the intake of the engine, which, through rotation of the intake flap, organizes the airflow movement. However, the air passage structure is complex, and the working environment is severe, so that the adjusting mechanism with the turning plate is very complicated and expensive; moreover, the flap may restrict flow and cause increased pumping losses.
Therefore, how to increase the turbulence level in the cylinder of the direct injection gasoline engine, thereby improving the engine performance, is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an air inlet control method of a direct injection gasoline engine. The method improves the turbulence level of fluid entering the cylinder by generating the Karman vortex street in the air inlet system, thereby enhancing the air flow movement in the cylinder, improving the oil-gas mixing process, improving the flame propagation rate, improving the performance of the engine, and simultaneously reducing the emission of Hydrocarbon (HC) and particles.
Another object of the present invention is to provide an intake control device for a direct injection gasoline engine that achieves the same effect.
In order to achieve the first object, the present invention provides an intake control method for a direct injection gasoline engine, comprising:
a Karman vortex street generating device is arranged on an airflow channel of an air inlet system of the direct injection gasoline engine;
when the direct-injection gasoline engine runs, acquiring actual air flow parameters flowing through the air flow channel;
and judging whether the actual airflow parameters fall within a preset parameter range, if so, opening the karman vortex street generating device to enable the airflow in the air intake system to generate the karman vortex street phenomenon through the karman vortex street generating device, and if not, closing the karman vortex street generating device.
Further, the actual airflow parameter is an actual reynolds number of the airflow, and the actual reynolds number of the airflow in the airflow channel is obtained according to the following mode:
obtaining the gas temperature T, the pressure p and the gas flow velocity v in the gas flow channel, and calculating the gas density rho and the gas viscosity coefficient mu in the gas flow channel according to the gas temperature T, the pressure p and the gas flow velocity v;
and calculating the actual Reynolds number of the air flow in the air flow channel according to the air density rho, the air viscosity coefficient mu and the air flow velocity v.
Further, the gas temperature T and the pressure p in the gas flow passage are acquired by an intake air temperature pressure sensor of the intake system.
Further, the flow velocity v of the airflow in the airflow channel is acquired through a flow sensor of the air inlet system.
Further, after the gas temperature T, the pressure p and the gas flow velocity v in the gas flow channel are obtained, according to the gas state equation: (p + a/v)0 2)(v0-b) RT and ρ M/v0The gas density can be calculated to obtain the gas density rho in the gas flow passage, wherein p is the pressure, and the unit is as follows: pa; t is temperature, unit: k; v. of0Molar volume, unit: l/mol; m is the molar mass of air, unit: g/mol; a and b are Van's correction; the gas viscosity coefficient mu can be obtained by looking up a table according to the gas temperature T in the channel.
Further, after obtaining the gas density ρ, the gas viscosity coefficient μ, according to the equation: and calculating to obtain an actual Reynolds number Re, wherein rho is the density of the fluid and has the unit: kg/m3(ii) a v is the average flow rate, in units: m/s; l is the characteristic length, and the unit is m; μ is kinetic viscosity coefficient, unit: pa · s.
Further, the set Reynolds number range is 500-15000.
To achieve the second object, the present invention provides an intake control device for a direct injection gasoline engine, comprising:
an air intake system;
the Karman vortex street generating device comprises a vortex street generator and an actuator; the vortex street generator is in transmission connection with the actuator and is rotatably arranged in an airflow channel of the air inlet system; the actuator is arranged outside an airflow channel of the air system and is connected to an engine management system on a circuit;
the engine management system controls the vortex street generator to have an opening state and a closing state through the actuator;
in the starting state, the vortex street generator rotates to a position where the length direction is vertical to the airflow direction;
in the closed state, the vortex street generator turns to a position where the length direction is consistent with the airflow direction.
Preferably, the direct-injection gasoline engine is a non-supercharged engine, and the vortex street generator of the karman vortex street generating device is installed in an air outlet pipe of an air filter of the engine.
Preferably, the direct injection gasoline engine is a supercharged engine, and the vortex street generator of the karman vortex street generating device is arranged in an air inlet channel from a hose-intercooler to a throttle valve.
The invention is equipped with the Karman vortex street generating device in the air intake system, while the engine runs, when judging the actual parameter is fallen into the parameter range that is presumed in advance, can confirm the engine is in the low-speed little load or high-speed heavy load working condition, at this moment through starting the Karman vortex street generating device, can make the airstream in the air intake system produce the Karman vortex street phenomenon through the Karman vortex street generating device, with the development of airstream, the vortex drops off and forms the turbulence constantly, thus improve the turbulence level entering the intracylinder fluid apparently, strengthen the intracylinder airstream movement, improve the mixing process of fuel oil and air, reduce the formation of wall and oil film of the fuel oil, in the combustion process, the turbulence can promote the exchange of the front face and unburned gas before the flame, raise the flame propagation rate, reduce the combustion fluctuation, and, the higher turbulence level is favorable to reducing HC and particulate emission.
The air inlet control device of the direct injection gasoline engine is provided with the Karman vortex street generating device in the air inlet system, and the air inlet control method of the direct injection gasoline engine has the technical effects, so the air inlet control device of the direct injection gasoline engine also has the corresponding technical effects.
Drawings
FIG. 1 is a schematic view showing that an airflow passes through a karman vortex street generating device to generate a karman vortex street phenomenon, and along with the development of the airflow, a vortex continuously falls off to form a turbulent flow;
FIG. 2 is a schematic view of a Karman vortex street generator in a closed state;
FIG. 3 is a top view of the karman vortex street generating apparatus shown in FIG. 2;
FIG. 4 is a schematic view of the karman vortex street generator in an open state;
FIG. 5 is a top view of the karman vortex street generating apparatus shown in FIG. 4;
FIG. 6 is a graph showing a comparison of fuel evaporation rates for an organized Karman vortex street and an unorganized Karman vortex street;
FIG. 7 is a graph showing a comparison of the uniformity of a mixture for organized and unorganized Karman vortex streets;
FIG. 8 is a graph comparing the turbulent combustion velocities for organized and unorganized Karman vortex streets.
In the figure:
1. karman vortex street generating device 2, airflow 3, throttle valve 4, vortex street generator 5, actuator 6, airflow channel 7 and vortex
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention provides a method for improving air flow movement in a cylinder and improving turbulence level in the cylinder, aiming at the problems that a gasoline direct injection engine has low flow level in a low-speed small-load cylinder and high-speed large-load fuel collides with the wall.
The method improves the turbulence level of fluid entering a cylinder by generating a Karman vortex street in an air inlet system, namely, a Karman vortex street generating device is arranged on an air outlet pipe of an air filter (aiming at a non-supercharged engine) or an air inlet pipeline from a hose-intercooler to a throttle valve (aiming at a supercharged engine) to ensure that airflow forms the Karman vortex street in the air inlet pipe, and along with the development of the airflow, vortex falls off to form turbulence, thus improving the airflow movement level in the cylinder and improving the performance of the engine.
Specifically, the air inlet control method of the direct injection gasoline engine comprises the following steps:
step S1: a Karman vortex street generating device is arranged in an air flow channel of an air inlet system of the direct injection gasoline engine.
Step S2: when the direct injection gasoline engine is operated, the actual Reynolds number of the air flow flowing through the air flow passage is obtained.
Further, the actual reynolds number of the gas flow in the gas flow channel is obtained as follows:
step S2.1: the method comprises the steps that a gas inlet temperature pressure sensor of a gas inlet system obtains the temperature T and the pressure p of gas in a gas flow channel, and a flow sensor of the gas inlet system collects the flow velocity v of the gas flow in the gas flow channel.
Step S2.2: after the gas temperature T, the pressure p and the gas flow velocity v in the gas flow channel are obtained, according to a gas state equation: (p + a/v)0 2)(v0-b) RT, calculating the gas density ρ and the gas viscosity coefficient μ in the gas flow channel from the gas temperature T, the pressure p and the gas flow velocity v, where p is the pressure in units: pa; t is temperature, unit: k; v. of0Molar volume, unit: l/mol; a and b are the van's correction.
Step S2.3: after obtaining the gas density ρ, the gas viscosity coefficient μ, according to the equation: and (2) calculating to obtain an actual Reynolds number according to the gas density rho, the gas viscosity coefficient mu and the gas flow velocity nu, wherein rho is the fluid density, and the unit is as follows: pa; v is the average flow rate, in units: m/s; l is the characteristic length, and the unit is m; μ is kinetic viscosity coefficient, unit: pa · s.
Step S3: and judging whether the actual Reynolds number falls within a preset Reynolds number range, wherein the set Reynolds number range is 500-15000, if so, opening the karman vortex street generating device, and if not, closing the karman vortex street generating device.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a karman vortex street phenomenon generated by airflow passing through a karman vortex street generating device, and a vortex continuously falls off to form a turbulent flow along with the development of the airflow.
As shown in the figure, through starting the Karman vortex street generating device 1, can make the air current 2 in the air intake system produce the Karman vortex street phenomenon through the Karman vortex street generating device 1, along with the development of air current, vortex 7 constantly drops and forms the torrent, thereby show and improve the torrent level of entering the intraductal fluid, strengthen the intracylinder air current motion, improve the mixing process of fuel and air, reduce the formation of strickling of fuel and oil film, in the combustion process, the torrent can promote the exchange of the front face of flame and the gas of not burning, improve flame propagation rate, reduce the combustion fluctuation, and, higher torrent level is favorable to reducing the emission of HC and particle.
Referring to fig. 2, fig. 3, fig. 4 and fig. 5, fig. 2 is a schematic view of the karman vortex street generator in a closed state; FIG. 3 is a top view of the karman vortex street generating apparatus shown in FIG. 2; FIG. 4 is a schematic view of the karman vortex street generator in an open state; FIG. 5 is a top view of the karman vortex street generating apparatus shown in FIG. 4.
In addition to the intake control method described above, the present invention also provides an intake control device for a direct injection gasoline engine, comprising:
an air intake system;
the Karman vortex street generating device 1 comprises a vortex street generator 4 and an actuator 5; wherein, the vortex street generator 4 is connected with the actuator 5 in a transmission way and is rotatably arranged in an airflow channel 6 of the air inlet system; the actuator 5 is located outside the air flow channel 6 of the air system and is electrically connected to the engine management system (not shown in the figures).
Specifically, the vortex street generator 4 may be a cylindrical turbulent flow body generating a vortex street phenomenon, the length of the cylindrical turbulent flow body is smaller than the inner diameter of the airflow channel, and the cylindrical turbulent flow body is rotatably installed at the central position of the airflow channel 6 through a rotating shaft, the actuator 5 may be an electric component (e.g., a motor) fixed outside the airflow channel, the power output end of the electric component is in transmission connection with the rotating shaft of the cylindrical turbulent flow body to drive the cylindrical turbulent flow body to rotate, and the signal input end of the electric component is connected to the engine management system and is controlled by the engine management system.
If the direct-injection gasoline engine is a non-supercharged engine, the vortex street generator 4 of the Karman vortex street generating device 1 is installed in the air outlet pipe of the air filter of the engine.
If the direct injection gasoline engine is a supercharged engine, the vortex street generator 4 of the Karman vortex street generator 1 is arranged in an air inlet channel from a hose-intercooler to a throttle valve.
When the engine management system determines that the engine is in a low-speed small-load or high-speed large-load working condition according to an air flow parameter (such as Reynolds number), the actuator 5 controls the vortex street generator 4 to rotate to an open state, and in the open state, the vortex street generator 4 rotates to a position with the length direction perpendicular to the air flow direction, so that the air flow in the air inlet system can generate a karman vortex street phenomenon through the karman vortex street generator, and along with the development of the air flow, the vortex continuously falls off to form a turbulent flow, thereby obviously improving the turbulence level of fluid entering a cylinder (see figure 1); when the engine management system determines that the engine exits from a low-speed small-load or high-speed large-load working condition according to the airflow parameters (such as Reynolds numbers), the actuator 5 controls the vortex street generator 4 to rotate to a closed state, and in the closed state, the vortex street generator 4 rotates to a position where the length direction is consistent with the airflow direction, and at the moment, the vortex street generator 4 conforms to the airflow direction, so that the karman vortex street phenomenon cannot be generated.
The above embodiments are merely preferred embodiments of the present invention, and are not limited thereto, and on the basis of the above embodiments, various embodiments can be obtained by performing targeted adjustment according to actual needs. For example, the vortex street generator 4 is designed into other shapes; alternatively, the engine management system may control the vortex street generator 4 to switch between on and off states by other means, and so on. This is not illustrated here, since many implementations are possible.
Referring to fig. 6, 7 and 8 together, fig. 6 is a graph showing the comparison of fuel evaporation amount between an organized karman vortex street and an unorganized karman vortex street; FIG. 7 is a graph showing a comparison of the uniformity of a mixture for organized and unorganized Karman vortex streets; FIG. 8 is a graph comparing the turbulent combustion velocities for organized and unorganized Karman vortex streets.
As shown in the figure, the turbulence level of air intake is improved through the Karman vortex street generating device, the fuel evaporation in the cylinder can be improved, the effect of oil-gas mixing is improved (see figure 6), the turbulence level of air intake is improved through the Karman vortex street generating device, the uniformity of oil-gas in the cylinder can be improved, the combustion is improved, the circular fluctuation of combustion is reduced (see figure 7), when the rotating speed of the engine is lower, the turbulence level of air intake can be improved through the Karman vortex street generating device, the flame propagation speed at the initial stage of combustion is improved, and the thermal efficiency of the engine can be increased (see figure 8).
The intake control method and the intake control device for the direct injection gasoline engine provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (7)
1. The air inlet control method of the direct injection gasoline engine comprises the following steps:
a Karman vortex street generating device is arranged on an airflow channel of an air inlet system of the direct injection gasoline engine;
when the direct-injection gasoline engine runs, obtaining actual airflow parameters flowing through the airflow channel, wherein the actual airflow parameters are actual Reynolds numbers of airflow;
judging whether the actual airflow parameters fall within a preset parameter range, wherein the set parameter range is a set Reynolds number range, if so, opening the karman vortex street generating device to enable the airflow in the air inlet system to generate a karman vortex street phenomenon through the karman vortex street generating device, and if not, closing the karman vortex generating device;
configuring the karman vortex street generating device to comprise a vortex street generator and an actuator; the vortex street generator is in transmission connection with the actuator and is rotatably arranged in an airflow channel of the air inlet system; the actuator is arranged outside an airflow channel of the air system and is connected to an engine management system on a circuit;
the engine management system controls the vortex street generator to have an opening state and a closing state through the actuator;
in the starting state, the vortex street generator rotates to a position where the length direction is vertical to the airflow direction;
in the closed state, the vortex street generator rotates to a position where the length direction is consistent with the airflow direction.
2. The intake control method for the direct-injection gasoline engine according to claim 1, characterized in that the actual reynolds number of the air flow in the air flow passage is obtained as follows:
obtaining the gas temperature T, the pressure p and the gas flow velocity v in the gas flow channel, and calculating the gas density rho and the gas viscosity coefficient mu in the gas flow channel according to the gas temperature T, the pressure p and the gas flow velocity v;
and calculating the actual Reynolds number of the air flow in the air flow channel according to the air density rho, the air viscosity coefficient mu and the air flow velocity v.
3. The intake control method for a direct-injection gasoline engine according to claim 2, characterized in that the gas temperature T and the pressure p in the gas flow passage are obtained by an intake air temperature pressure sensor of the intake system.
4. The intake control method for the direct-injection gasoline engine according to claim 2, characterized in that the flow velocity v of the airflow in the airflow passage is collected by a flow sensor of the intake system.
5. The intake control method of a direct injection gasoline engine according to claim 2,
after the gas temperature T, the pressure p and the gas flow velocity v in the gas flow channel are obtained, according to a gas state equation: (p + a/v)0 2)(v0-b) RT and ρ M/v0The gas density can be calculated to obtain the gas density rho in the gas flow passage, wherein p is the pressure, and the unit is as follows: pa; t is temperature, unit: k; v. of0Molar volume, unit: l/mol; m is the molar mass of air, unit: g/mol; a and b are Van's correction; the gas viscosity coefficient mu can be obtained by looking up a table according to the gas temperature T in the channel.
6. The intake control method of a direct injection gasoline engine according to claim 5,
after obtaining the gas density ρ, the gas viscosity coefficient μ, according to the equation: and calculating to obtain an actual Reynolds number Re, wherein rho is the density of the fluid and has the unit: kg/m3(ii) a v is the average flow rate, in units: m/s; l is the characteristic length, and the unit is m; μ is kinetic viscosity coefficient, unit: pa · s.
7. The intake control method for a direct injection gasoline engine according to any one of claims 2 to 6, wherein the set Reynolds number is in a range of 500 to 15000.
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| CN201810312979.4A CN110360000B (en) | 2018-04-09 | 2018-04-09 | Air intake control method for direct injection gasoline engine |
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| CN110360000A (en) | 2019-10-22 |
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